c:java_code>javac SpeedTest.java && java SpeedTest5.776E+17, 1.075, 2.747, 0.391.c:java_code>javac SpeedTest.java && java SpeedTest5.776E+17, 1.075, 2.742, 0.392.c:java_code>java SpeedTest 169.235E+18, 17.190, 2.930, 5.867.c:java_code>java SpeedTest 1005.771E+19, 107.431, 9.990, 10.754.c:java_code>java SpeedTest 1 105.776E+19, 10.748, 27.741, 0.387.c:java_code>java SpeedTest 105.772E+18, 10.745, 2.846, 3.775.c:java_code>java SpeedTest 201.154E+19, 21.487, 3.711, 5.790.c:java_code>java SpeedTest 301.731E+19, 32.227, 4.559, 7.069.c:java_code>java SpeedTest 402.308E+19, 42.970, 5.500, 7.813.c:java_code>java SpeedTest 52.887E+18, 5.373, 2.828, 1.900.c:java_code>java SpeedTest 1005.771E+19, 107.431, 8.992, 11.947.c:java_code>java SpeedTest 2001.154E+20, 214.858, 16.149, 13.305.c:java_code>java SpeedTest 2001.154E+20, 214.858, 15.068, 14.259.c:java_code>java SpeedTest 200 101.154E+22, 2148.585, 156.073, 13.767.
MacBook Pro 2021haowei@Haos-MacBook-Pro-2021-M1-Pro java_code % java SpeedTest 5.776E+17, 1.075, 4.482, 0.240.haowei@Haos-MacBook-Pro-2021-M1-Pro java_code % java SpeedTest 5.776E+17, 1.075, 4.509, 0.238.haowei@Haos-MacBook-Pro-2021-M1-Pro java_code % java SpeedTest 21.155E+18, 2.150, 4.583, 0.469.haowei@Haos-MacBook-Pro-2021-M1-Pro java_code % java SpeedTest 148.079E+18, 15.041, 7.040, 2.136.haowei@Haos-MacBook-Pro-2021-M1-Pro java_code % java SpeedTest 2001.154E+20, 214.858, 83.269, 2.580.haowei@Haos-MacBook-Pro-2021-M1-Pro java_code % java SpeedTest 1 105.776E+19, 10.748, 44.697, 0.240.
MacBook Pro 2018多核跑分:
5.77e+21, 1074.31, 166.83, 6.44
单核跑分
5.78e+19, 10.75, 25.21, 0.47.
5950X 跑分 执行结果：约为 15.50 左右
除了个别几次由于某些原因导致的降速度为10左右，大部分结果在15-16，故取15.50为性能结果。
for /L %i in (1,1,10) do @echo off && java SpeedTest# SUM, COUNT (B), TIME(s), SPEED(B/s)5.77e+19, 107.43, 10.68, 10.06.5.77e+19, 107.43, 10.33, 10.40.5.77e+19, 107.43, 6.87, 15.64.5.77e+19, 107.43, 11.94, 9.00.5.77e+19, 107.43, 6.97, 15.41.5.77e+19, 107.43, 6.46, 16.62.5.77e+19, 107.43, 6.47, 16.61.5.77e+19, 107.43, 7.05, 15.23.5.77e+19, 107.43, 6.92, 15.52.5.77e+19, 107.43, 6.77, 15.87.
CPU 占用情况
import java.util.Random;public class SpeedTest {public static Random rand = new Random(0);public static void main(String[] args) throws Exception {// show helpif(args.length > 0 && args[0].toLowerCase().equals("help")){System.out.println("SUM, COUNT (B), TIME(s), SPEED(B/s)");return;}// get argumentsint threadCount = args.length > 0 ? Integer.parseInt(args[0]) : 1;int coefficient = args.length > 1 ? Integer.parseInt(args[1]) : 1;// define variablesdouble[] results = new double[threadCount]; long[] counts = new long[threadCount];Thread[] threads = new Thread[threadCount];for (int i = 0; i < threadCount; i++) {threads[i] = new Thread("Subthread-" + i) {@Overridepublic void run() {int tid = Integer.parseInt(getName().split("-")[1]);counts[tid] = 1048576L * (1024 + rand.nextInt(2)) * coefficient;results[tid] = get_sum(0, counts[tid]);}double get_sum(long start, long end) {double result = 0;for(long i = start; i < end; i ++)result += i;return result;}};}// start all threadsvar t1 = System.currentTimeMillis();for (int i = 0; i < threads.length; i++) threads[i].start();// wait threads to finishfor (int i = 0; i < threads.length; i++) threads[i].join();var t2 = System.currentTimeMillis();// sum all resultsdouble total_sum = 0;double total_count = 0;for (int i = 0; i < threads.length; i++){total_sum += results[i];total_count += counts[i];}// format and output resultstotal_count /= 1E9; // in Billionsdouble time = (t2 - t1)/1000.0;var speed = total_count / time;System.out.printf("%8.3E, %8.3f, %8.3f, %8.3f.n", total_sum, total_count, time, speed);}}
测试代码 2.0import java.util.ArrayList;import java.util.Random;public class SpeedTest {public static double res = 0;public static long count = 0;public static Random rand;public static double[] results; public static long[] counts; public static int[] elasptime;public static int threadCount = 100;public static void main(String[] args) throws Exception {threadCount = 100;Random rand = new Random(0);results = new double[threadCount]; counts = new long[threadCount];elasptime = new int[threadCount];Thread[] threads = new Thread[threadCount]; for (int i = 0; i < threadCount; i++) {threads[i] = new Thread() {@Overridepublic void run() {var name = Thread.currentThread().getName();if(!name.contains("-")) return;int tid = Integer.parseInt(name.split("-")[1]);long len = 1024 * 1024 * (1024 + rand.nextInt(2));double sum = 0;for (long i = 0; i < len; i++)sum += i;counts[tid] = len;results[tid] = sum;}};}// System.out.println("---- Start ----");var t1 = System.currentTimeMillis();for (int i = 0; i < threads.length; i++) threads[i].start();// System.out.println("---- Threads Join ---");for (int i = 0; i < threads.length; i++) threads[i].join();var t2 = System.currentTimeMillis();double total_sum = 0;double total_count = 0;for (int i = 0; i < threads.length; i++){total_sum += results[i];total_count += counts[i];}total_count /= 1E9; // in Billionsdouble time = (t2 - t1)/1000.0;var speed = total_count / time;System.out.printf("%5.2e, %5.2f, %5.2f, %5.2f.n", total_sum, total_count, time, speed);// System.out.println("--- FINISH ---");}}
测试代码 1.0import java.util.ArrayList;import java.util.Random;public class SpeedTest {public static double res = 0;public static long count = 0;public static Random rand = new Random(0);public static void main(String[] args) throws Exception {// heavy_task();double[] results = new double[100];Thread[] threads = new Thread[30];for (int i = 0; i < threads.length; i++) {threads[i] = new Thread() {@Overridepublic void run() {HwTimer timer = new HwTimer();timer.start();timer.result = 0;timer.count = 1024 * 1024 * (1024 + rand.nextInt(2));for (long i = 0; i < timer.count; i++)timer.result += i;timer.stop();timer.show();RandomDemo.count += timer.count;// var res1 = heavy_task();var name = Thread.currentThread().getName();if(name.contains("-")) {results[Integer.parseInt(name.split("-")[1])] = timer.result;// System.out.println("timer.result: " + timer.result);}}};}System.out.println("---- Start ----");HwTimer timer = new HwTimer();timer.start();for (int i = 0; i < threads.length; i++) threads[i].start();// System.out.println("---- Threads Join ---");for (int i = 0; i < threads.length; i++) threads[i].join();timer.stop();timer.count = RandomDemo.count;timer.result = 0;for (int i = 0; i < threads.length; i++) timer.result += results[i];timer.show();}public static double heavy_task() {HwTimer timer = new HwTimer();timer.start();timer.result = 0;timer.count = 1024 * 1024 * (1021 + rand.nextInt(2));for (long i = 0; i < timer.count; i++)timer.result += i;timer.stop();timer.show();return timer.result;}public static void randDemo() {Random rand = new Random(11);ArrayList
public class HwTimer {public static void main(String[] args) {// TODO Auto-generated method stub}public long startTime = 0;public long endTime = 0;public String name = "no name";public double result = 1;public long count = 1;public void start() {startTime = System.currentTimeMillis();}public void stop() {endTime = System.currentTimeMillis();}public void show() {var name = Thread.currentThread().getName();var time = (endTime - startTime) / 1000.0;var speed = count / time / 1E9;var count1 = count * 1.0 / 1E9;System.out.printf("%s: res=%5.2e, count=%5.2f B, time=%5.2fs, speed = %5.2f B/sn", name, result, count1, time, speed);}}